CFM is cubic feet per minute. The amount of air, in cubic feet, that Flows through a given space in one minute. 1 CFM equals approximately 2 liters per second (l/s).
Other /More definition:
Cubic feet per minute. The amount of air, in cubic feet, that flows through a given space in one minute. 1 CFM equals approximately 2 liters per second (l/s).

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